mozjpeg

Improved JPEG encoder with better compression and quality

brewmacoslinux

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Improved JPEG encoder

cjpegdjpegjpegtran

compress JPEG image to smaller file size$ cjpeg -quality 85 input.jpg > output.jpg

convert PNG to optimized JPEG$ cjpeg -quality 80 image.png > image.jpg

reduce JPEG file size with quality setting$ cjpeg -quality 75 large.jpg > compressed.jpg

convert JPEG back to uncompressed format$ djpeg -bmp input.jpg > output.bmp

rotate JPEG image without recompression$ jpegtran -rotate 90 input.jpg > rotated.jpg